Mercurial > sdl-ios-xcode
annotate src/audio/macrom/SDL_romaudio.c @ 348:25809353f877
Re-added MacOS X audio locking
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 13 Apr 2002 23:31:07 +0000 |
| parents | f25f666d609a |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #if TARGET_API_MAC_CARBON | |
| 29 # include <Carbon.h> | |
| 30 #else | |
| 31 # include <Sound.h> /* SoundManager interface */ | |
| 32 # include <Gestalt.h> | |
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33 # include <DriverServices.h> |
| 0 | 34 #endif |
| 35 | |
| 36 #include <stdlib.h> | |
| 37 #include <stdio.h> | |
| 38 | |
| 39 #include "SDL_endian.h" | |
| 40 #include "SDL_audio.h" | |
| 41 #include "SDL_audio_c.h" | |
| 42 #include "SDL_audiomem.h" | |
| 43 #include "SDL_sysaudio.h" | |
| 44 #include "SDL_romaudio.h" | |
| 45 | |
| 46 /* Audio driver functions */ | |
| 47 | |
| 48 static void Mac_CloseAudio(_THIS); | |
| 49 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
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50 static void Mac_LockAudio(_THIS); |
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51 static void Mac_UnlockAudio(_THIS); |
| 0 | 52 |
| 53 /* Audio driver bootstrap functions */ | |
| 54 | |
| 55 | |
| 56 static int Audio_Available(void) | |
| 57 { | |
| 58 return(1); | |
| 59 } | |
| 60 | |
| 61 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 62 { | |
| 63 free(device->hidden); | |
| 64 free(device); | |
| 65 } | |
| 66 | |
| 67 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 68 { | |
| 69 SDL_AudioDevice *this; | |
| 70 | |
| 71 /* Initialize all variables that we clean on shutdown */ | |
| 72 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 73 if ( this ) { | |
| 74 memset(this, 0, (sizeof *this)); | |
| 75 this->hidden = (struct SDL_PrivateAudioData *) | |
| 76 malloc((sizeof *this->hidden)); | |
| 77 } | |
| 78 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 79 SDL_OutOfMemory(); | |
| 80 if ( this ) { | |
| 81 free(this); | |
| 82 } | |
| 83 return(0); | |
| 84 } | |
| 85 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 86 | |
| 87 /* Set the function pointers */ | |
| 88 this->OpenAudio = Mac_OpenAudio; | |
| 89 this->CloseAudio = Mac_CloseAudio; | |
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90 this->LockAudio = Mac_LockAudio; |
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91 this->UnlockAudio = Mac_UnlockAudio; |
| 0 | 92 this->free = Audio_DeleteDevice; |
| 93 | |
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94 #ifdef MACOSX /* MacOS X uses threaded audio, so normal thread code is okay */ |
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95 this->LockAudio = NULL; |
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96 this->UnlockAudio = NULL; |
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97 #endif |
| 0 | 98 return this; |
| 99 } | |
| 100 | |
| 101 AudioBootStrap SNDMGR_bootstrap = { | |
| 102 "sndmgr", "MacOS SoundManager 3.0", | |
| 103 Audio_Available, Audio_CreateDevice | |
| 104 }; | |
| 105 | |
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106 #if defined(TARGET_API_MAC_CARBON) || defined(USE_RYANS_SOUNDCODE) |
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107 /* This works correctly on MacOS X */ |
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108 |
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109 #pragma options align=power |
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110 |
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111 static volatile SInt32 audio_is_locked = 0; |
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112 static volatile SInt32 need_to_mix = 0; |
| 0 | 113 |
| 114 static UInt8 *buffer[2]; | |
| 115 static volatile UInt32 running = 0; | |
| 116 static CmpSoundHeader header; | |
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117 static volatile Uint32 fill_me = 0; |
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118 |
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119 static void mix_buffer(SDL_AudioDevice *audio, UInt8 *buffer) |
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120 { |
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121 if ( ! audio->paused ) { |
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122 #ifdef MACOSX |
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123 SDL_mutexP(audio->mixer_lock); |
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124 #endif |
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125 if ( audio->convert.needed ) { |
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126 audio->spec.callback(audio->spec.userdata, |
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127 (Uint8 *)audio->convert.buf,audio->convert.len); |
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128 SDL_ConvertAudio(&audio->convert); |
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129 if ( audio->convert.len_cvt != audio->spec.size ) { |
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130 /* Uh oh... probably crashes here */; |
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131 } |
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132 memcpy(buffer, audio->convert.buf, audio->convert.len_cvt); |
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133 } else { |
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134 audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size); |
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135 } |
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136 #ifdef MACOSX |
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137 SDL_mutexV(audio->mixer_lock); |
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138 #endif |
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139 } |
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140 |
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141 DecrementAtomic((SInt32 *) &need_to_mix); |
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142 } |
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143 |
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144 static void Mac_LockAudio(_THIS) |
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145 { |
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146 IncrementAtomic((SInt32 *) &audio_is_locked); |
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147 } |
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148 |
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149 static void Mac_UnlockAudio(_THIS) |
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150 { |
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151 SInt32 oldval; |
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152 |
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153 oldval = DecrementAtomic((SInt32 *) &audio_is_locked); |
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154 if ( oldval != 1 ) /* != 1 means audio is still locked. */ |
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155 return; |
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156 |
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157 /* Did we miss the chance to mix in an interrupt? Do it now. */ |
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158 if ( BitAndAtomic (0xFFFFFFFF, (UInt32 *) &need_to_mix) ) { |
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159 /* |
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160 * Note that this could be a problem if you missed an interrupt |
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161 * while the audio was locked, and get preempted by a second |
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162 * interrupt here, but that means you locked for way too long anyhow. |
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163 */ |
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164 mix_buffer (this, buffer[fill_me]); |
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165 } |
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166 } |
| 0 | 167 |
| 168 static void callBackProc (SndChannel *chan, SndCommand *cmd_passed ) { | |
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169 UInt32 play_me; |
| 0 | 170 SndCommand cmd; |
| 171 SDL_AudioDevice *audio = (SDL_AudioDevice *)chan->userInfo; | |
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172 |
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173 IncrementAtomic((SInt32 *) &need_to_mix); |
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174 |
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175 fill_me = cmd_passed->param2; /* buffer that has just finished playing, so fill it */ |
| 0 | 176 play_me = ! fill_me; /* filled buffer to play _now_ */ |
| 177 | |
| 178 if ( ! audio->enabled ) { | |
| 179 return; | |
| 180 } | |
| 181 | |
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182 /* queue previously mixed buffer for playback. */ |
| 0 | 183 header.samplePtr = (Ptr)buffer[play_me]; |
| 184 cmd.cmd = bufferCmd; | |
| 185 cmd.param1 = 0; | |
| 186 cmd.param2 = (long)&header; | |
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187 SndDoCommand (chan, &cmd, 0); |
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188 |
| 0 | 189 memset (buffer[fill_me], 0, audio->spec.size); |
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190 |
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191 /* |
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192 * if audio device isn't locked, mix the next buffer to be queued in |
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193 * the memory block that just finished playing. |
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194 */ |
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195 if ( ! BitAndAtomic(0xFFFFFFFF, (UInt32 *) &audio_is_locked) ) { |
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196 mix_buffer (audio, buffer[fill_me]); |
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197 } |
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198 |
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199 /* set this callback to run again when current buffer drains. */ |
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200 if ( running ) { |
| 0 | 201 cmd.cmd = callBackCmd; |
| 202 cmd.param1 = 0; | |
| 203 cmd.param2 = play_me; | |
| 204 | |
| 205 SndDoCommand (chan, &cmd, 0); | |
| 206 } | |
| 207 } | |
| 208 | |
| 209 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec) { | |
| 210 | |
| 211 SndCallBackUPP callback; | |
| 212 int sample_bits; | |
| 213 int i; | |
| 214 long initOptions; | |
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215 |
| 0 | 216 /* Very few conversions are required, but... */ |
| 217 switch (spec->format) { | |
| 218 case AUDIO_S8: | |
| 219 spec->format = AUDIO_U8; | |
| 220 break; | |
| 221 case AUDIO_U16LSB: | |
| 222 spec->format = AUDIO_S16LSB; | |
| 223 break; | |
| 224 case AUDIO_U16MSB: | |
| 225 spec->format = AUDIO_S16MSB; | |
| 226 break; | |
| 227 } | |
| 228 SDL_CalculateAudioSpec(spec); | |
| 229 | |
| 230 /* initialize bufferCmd header */ | |
| 231 memset (&header, 0, sizeof(header)); | |
| 232 callback = NewSndCallBackUPP (callBackProc); | |
| 233 sample_bits = spec->size / spec->samples / spec->channels * 8; | |
| 234 | |
| 235 #ifdef DEBUG_AUDIO | |
| 236 fprintf(stderr, | |
| 237 "Audio format 0x%x, channels = %d, sample_bits = %d, frequency = %d\n", | |
| 238 spec->format, spec->channels, sample_bits, spec->freq); | |
| 239 #endif /* DEBUG_AUDIO */ | |
| 240 | |
| 241 header.numChannels = spec->channels; | |
| 242 header.sampleSize = sample_bits; | |
| 243 header.sampleRate = spec->freq << 16; | |
| 244 header.numFrames = spec->samples; | |
| 245 header.encode = cmpSH; | |
| 246 | |
| 247 /* Note that we install the 16bitLittleEndian Converter if needed. */ | |
| 248 if ( spec->format == 0x8010 ) { | |
| 249 header.compressionID = fixedCompression; | |
| 250 header.format = k16BitLittleEndianFormat; | |
| 251 } | |
| 252 | |
| 253 /* allocate 2 buffers */ | |
| 254 for (i=0; i<2; i++) { | |
| 255 buffer[i] = (UInt8*)malloc (sizeof(UInt8) * spec->size); | |
| 256 if (buffer[i] == NULL) { | |
| 257 SDL_OutOfMemory(); | |
| 258 return (-1); | |
| 259 } | |
| 260 memset (buffer[i], 0, spec->size); | |
| 261 } | |
| 262 | |
| 263 /* Create the sound manager channel */ | |
| 264 channel = (SndChannelPtr)malloc(sizeof(*channel)); | |
| 265 if ( channel == NULL ) { | |
| 266 SDL_OutOfMemory(); | |
| 267 return(-1); | |
| 268 } | |
| 269 if ( spec->channels >= 2 ) { | |
| 270 initOptions = initStereo; | |
| 271 } else { | |
| 272 initOptions = initMono; | |
| 273 } | |
| 274 channel->userInfo = (long)this; | |
| 275 channel->qLength = 128; | |
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276 if ( SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr ) { |
| 0 | 277 SDL_SetError("Unable to create audio channel"); |
| 278 free(channel); | |
| 279 channel = NULL; | |
| 280 return(-1); | |
| 281 } | |
| 282 | |
| 283 /* start playback */ | |
| 284 { | |
| 285 SndCommand cmd; | |
| 286 cmd.cmd = callBackCmd; | |
| 287 cmd.param2 = 0; | |
| 288 running = 1; | |
| 289 SndDoCommand (channel, &cmd, 0); | |
| 290 } | |
| 291 | |
| 292 return 1; | |
| 293 } | |
| 294 | |
| 295 static void Mac_CloseAudio(_THIS) { | |
| 296 | |
| 297 int i; | |
| 298 | |
| 299 running = 0; | |
| 300 | |
| 301 if (channel) { | |
| 302 SndDisposeChannel (channel, true); | |
| 303 channel = NULL; | |
| 304 } | |
| 305 | |
| 306 for ( i=0; i<2; ++i ) { | |
| 307 if ( buffer[i] ) { | |
| 308 free(buffer[i]); | |
| 309 buffer[i] = NULL; | |
| 310 } | |
| 311 } | |
| 312 } | |
| 313 | |
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314 #else /* !TARGET_API_MAC_CARBON && !USE_RYANS_SOUNDCODE */ |
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315 |
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316 static void Mac_LockAudio(_THIS) |
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317 { |
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318 /* no-op. */ |
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319 } |
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320 |
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321 static void Mac_UnlockAudio(_THIS) |
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322 { |
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323 /* no-op. */ |
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324 } |
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325 |
| 0 | 326 |
| 327 /* This function is called by Sound Manager when it has exhausted one of | |
| 328 the buffers, so we'll zero it to silence and fill it with audio if | |
| 329 we're not paused. | |
| 330 */ | |
| 331 static pascal | |
| 332 void sndDoubleBackProc (SndChannelPtr chan, SndDoubleBufferPtr newbuf) | |
| 333 { | |
| 334 SDL_AudioDevice *audio = (SDL_AudioDevice *)newbuf->dbUserInfo[0]; | |
| 335 | |
| 336 /* If audio is quitting, don't do anything */ | |
| 337 if ( ! audio->enabled ) { | |
| 338 return; | |
| 339 } | |
| 340 memset (newbuf->dbSoundData, 0, audio->spec.size); | |
| 341 newbuf->dbNumFrames = audio->spec.samples; | |
| 342 if ( ! audio->paused ) { | |
| 343 if ( audio->convert.needed ) { | |
| 344 audio->spec.callback(audio->spec.userdata, | |
| 345 (Uint8 *)audio->convert.buf,audio->convert.len); | |
| 346 SDL_ConvertAudio(&audio->convert); | |
| 347 #if 0 | |
| 348 if ( audio->convert.len_cvt != audio->spec.size ) { | |
| 349 /* Uh oh... probably crashes here */; | |
| 350 } | |
| 351 #endif | |
| 352 memcpy(newbuf->dbSoundData, audio->convert.buf, | |
| 353 audio->convert.len_cvt); | |
| 354 } else { | |
| 355 audio->spec.callback(audio->spec.userdata, | |
| 356 (Uint8 *)newbuf->dbSoundData, audio->spec.size); | |
| 357 } | |
| 358 } | |
| 359 newbuf->dbFlags |= dbBufferReady; | |
| 360 } | |
| 361 | |
| 362 static int DoubleBufferAudio_Available(void) | |
| 363 { | |
| 364 int available; | |
| 365 NumVersion sndversion; | |
| 366 long response; | |
| 367 | |
| 368 available = 0; | |
| 369 sndversion = SndSoundManagerVersion(); | |
| 370 if ( sndversion.majorRev >= 3 ) { | |
| 371 if ( Gestalt(gestaltSoundAttr, &response) == noErr ) { | |
| 372 if ( (response & (1 << gestaltSndPlayDoubleBuffer)) ) { | |
| 373 available = 1; | |
| 374 } | |
| 375 } | |
| 376 } else { | |
| 377 if ( Gestalt(gestaltSoundAttr, &response) == noErr ) { | |
| 378 if ( (response & (1 << gestaltHasASC)) ) { | |
| 379 available = 1; | |
| 380 } | |
| 381 } | |
| 382 } | |
| 383 return(available); | |
| 384 } | |
| 385 | |
| 386 static void Mac_CloseAudio(_THIS) | |
| 387 { | |
| 388 int i; | |
| 389 | |
| 390 if ( channel != NULL ) { | |
| 391 /* Clean up the audio channel */ | |
| 392 SndDisposeChannel(channel, true); | |
| 393 channel = NULL; | |
| 394 } | |
| 395 for ( i=0; i<2; ++i ) { | |
| 396 if ( audio_buf[i] ) { | |
| 397 free(audio_buf[i]); | |
| 398 audio_buf[i] = NULL; | |
| 399 } | |
| 400 } | |
| 401 } | |
| 402 | |
| 403 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 404 { | |
| 405 SndDoubleBufferHeader2 audio_dbh; | |
| 406 int i; | |
| 407 long initOptions; | |
| 408 int sample_bits; | |
| 409 SndDoubleBackUPP doubleBackProc; | |
| 410 | |
| 411 /* Check to make sure double-buffered audio is available */ | |
| 412 if ( ! DoubleBufferAudio_Available() ) { | |
| 413 SDL_SetError("Sound manager doesn't support double-buffering"); | |
| 414 return(-1); | |
| 415 } | |
| 416 | |
| 417 /* Very few conversions are required, but... */ | |
| 418 switch (spec->format) { | |
| 419 case AUDIO_S8: | |
| 420 spec->format = AUDIO_U8; | |
| 421 break; | |
| 422 case AUDIO_U16LSB: | |
| 423 spec->format = AUDIO_S16LSB; | |
| 424 break; | |
| 425 case AUDIO_U16MSB: | |
| 426 spec->format = AUDIO_S16MSB; | |
| 427 break; | |
| 428 } | |
| 429 SDL_CalculateAudioSpec(spec); | |
| 430 | |
| 431 /* initialize the double-back header */ | |
| 432 memset(&audio_dbh, 0, sizeof(audio_dbh)); | |
| 433 doubleBackProc = NewSndDoubleBackProc (sndDoubleBackProc); | |
| 434 sample_bits = spec->size / spec->samples / spec->channels * 8; | |
| 435 | |
| 436 audio_dbh.dbhNumChannels = spec->channels; | |
| 437 audio_dbh.dbhSampleSize = sample_bits; | |
| 438 audio_dbh.dbhCompressionID = 0; | |
| 439 audio_dbh.dbhPacketSize = 0; | |
| 440 audio_dbh.dbhSampleRate = spec->freq << 16; | |
| 441 audio_dbh.dbhDoubleBack = doubleBackProc; | |
| 442 audio_dbh.dbhFormat = 0; | |
| 443 | |
| 444 /* Note that we install the 16bitLittleEndian Converter if needed. */ | |
| 445 if ( spec->format == 0x8010 ) { | |
| 446 audio_dbh.dbhCompressionID = fixedCompression; | |
| 447 audio_dbh.dbhFormat = k16BitLittleEndianFormat; | |
| 448 } | |
| 449 | |
| 450 /* allocate the 2 double-back buffers */ | |
| 451 for ( i=0; i<2; ++i ) { | |
| 452 audio_buf[i] = calloc(1, sizeof(SndDoubleBuffer)+spec->size); | |
| 453 if ( audio_buf[i] == NULL ) { | |
| 454 SDL_OutOfMemory(); | |
| 455 return(-1); | |
| 456 } | |
| 457 audio_buf[i]->dbNumFrames = spec->samples; | |
| 458 audio_buf[i]->dbFlags = dbBufferReady; | |
| 459 audio_buf[i]->dbUserInfo[0] = (long)this; | |
| 460 audio_dbh.dbhBufferPtr[i] = audio_buf[i]; | |
| 461 } | |
| 462 | |
| 463 /* Create the sound manager channel */ | |
| 464 channel = (SndChannelPtr)malloc(sizeof(*channel)); | |
| 465 if ( channel == NULL ) { | |
| 466 SDL_OutOfMemory(); | |
| 467 return(-1); | |
| 468 } | |
| 469 if ( spec->channels >= 2 ) { | |
| 470 initOptions = initStereo; | |
| 471 } else { | |
| 472 initOptions = initMono; | |
| 473 } | |
| 474 channel->userInfo = 0; | |
| 475 channel->qLength = 128; | |
| 476 if ( SndNewChannel(&channel, sampledSynth, initOptions, 0L) != noErr ) { | |
| 477 SDL_SetError("Unable to create audio channel"); | |
| 478 free(channel); | |
| 479 channel = NULL; | |
| 480 return(-1); | |
| 481 } | |
| 482 | |
| 483 /* Start playback */ | |
| 484 if ( SndPlayDoubleBuffer(channel, (SndDoubleBufferHeaderPtr)&audio_dbh) | |
| 485 != noErr ) { | |
| 486 SDL_SetError("Unable to play double buffered audio"); | |
| 487 return(-1); | |
| 488 } | |
| 489 | |
| 490 return 1; | |
| 491 } | |
| 492 | |
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493 #endif /* TARGET_API_MAC_CARBON || USE_RYANS_SOUNDCODE */ |
| 0 | 494 |